预应力混凝土连续刚构桥施工监控分析

Analysis on Construction Monitoring of Prestressed Concrete Continuous Rigid Frame Bridge

以某预应力混凝土变截面连续刚构桥为研究对象,对承台沉降、应力和主梁阶段标高进行了监测,并对监测结果进行了分析,得到以下结论:通过对该大桥梁底立模标高复核,未发现梁段立模标高偏差超过规范要求的±10mm;通过对混凝土浇注前后、预应力张拉前后箱梁顶面、底面观测点高程的对比可知,混凝土浇注、预应力张拉对主梁节段高程的影响基本符合理论原理,处于正常状态;通过对该大桥主梁应力的监测和控制,实测应力在控制范围内,实测应力与理论应力较接近,实现了应力控制的目标;该大桥上部结构主梁施工线形、应力满足设计要求,实现了桥梁上部结构施工监控的目标。

Taking a prestressed concrete continuous rigid frame bridge with variable cross section as the research object,the monitoring on the abutment settlement,stress and elevation at the section of main beam is performed,and the monitoring results are analyzed.The following conclusions are obtained:through the review on template elevation of beam bottom of the bridge,±10mm of the deviation of the template elevation at the section of beam exceeding the specification requirement is not discovered;through the comparison of the elevation of observation points at the top and bottom of box beam before and after concrete pouring and prestress tension,we can learn that,the influence of concrete pouring and prestress tension on the elevation of the main beam segment basically conforms to the theoretical principle and is in a normal state;through the monitoring and control of the stress of the main beam of the bridge,the measured stress is within the control range,and the measured stress is close to the theoretical stress,and the goal of stress control is achieved;the construction alignment and stress of the main beam on the upper structure of the bridge meet the design requirements,and the goal of construction monitoring of the upper structure of the bridge is achieved.